Windows: We've featured distraction-blocking apps before, but Cold Turkey might just be one of the cruelest. It allows you to block websites and apps at scheduled times and, when those hours come along, you're stuck with those settings.

Mac OS X only: Feel like you waste too much time on Facebook, Twitter, or some other internet time…
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The fundamental problem with every distraction blocker is that you can usually circumvent them just as easily as you set them up. Cold Turkey, on the other hand, promises that you can't kill it via the task manager, uninstall it while it's running, or change your system time to get around it. While there is a worst-case scenario removal tool, hopefully your lack of self-control won't get that bad.